fixing the switching of 1.5.4 to RC builds

releng.control/cc_config.xml

@@ -206,11 +206,11 @@
                 -->
                 <property
                     name="buildType"
-                    value="RC" />
+                    value="M" />
 
                 <property
                     name="buildId"
-                    value="1.5.4" />
+                    value="RC1.5.4" />
                 <property
                     name="buildBranch"
                     value="R1.5" />